Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1997-02-07
1999-05-25
Hoke, Veronica P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
428386, 428387, 428388, 428389, 524159, 524169, 524413, 524904, C08K 520, C08K 536, C08K 548
Patent
active
059070064
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to compositions for the coating of substrates of matt surface appearance.
PRIOR ART
Coatings for substrates based on polymers, for example based on polyamide (PA), polyester or epoxy resins are widely employed for coating metal substrates. However, such coatings generally exhibit some gloss which it is sometimes desirable to avoid, for example for covering some motor vehicle parts (bumpers, etc.) and in the case of some components of decorative furniture and construction in the fields of interior decoration, of furnishing and of building.
To impart mattness to polymer-based compositions it has been proposed to incorporate into the resins inorganic substances or fillers such as calcium carbonate, silica or talc. To obtain coating whose 60.degree. specular gloss is 30%, the quantity of fillers is higher than 40% by weight and the composition then undergoes a significant decrease in its mechanical properties; it is impossible to obtain even greater mattness without causing unacceptable detriment to the other properties of the coatings.
It has also been proposed to add to these compositions either resins such as a cyclic amidine, polycarboxylic acid or an ionomer resin, or thermoplastic resins such as polyolefins; here too, however, the degree of mattness is insufficient and the mechanical properties are impaired, as is the thermal stability of the coating (yellowing).
DESCRIPTION OF THE INVENTION
The invention relates to compositions based on resins for the coating of substrates of matt surface appearance and whose mechanical properties are similar to those of unfilled compositions. The degree of mattness of a surface is assessed by measuring specular gloss, that is to say the ratio of the intensity of radiation reflected by this surface to the incident radiation applied. A surface will be considered to be "matt" if, with an incident radiation forming an angle of 60.degree. with the said surface, the reflected radiation/incident radiation ratio is lower than or equal to 30%.
The resins or polymers of the coating compositions may be thermoplastic resins or heat-curable resins.
By way of example of thermoplastic resins there may be mentioned PA-12,12, PA-6, PA-6,6, PA-6,12 and polyamide-based thermoplastic elastomers, by themselves, mixed and/or copolymerized.
By way of example of heat-curable resins there may be mentioned
Acrylic and polyurethane resins which are also suitable can be either thermoplastic or heat-curable, like some polyester resins.
Polyesters are intended to mean the resins originating from the condensation reactions between mono- and polyfunctional acids with anhydrides, polyols or esters.
Epoxy resins are intended to mean the products originating from the chemistry of bisphenol A diglycidyl ether, also called BADGE and the products originating from the chemistry of the glycidyl ether of novolac resins. The BADGE resins employed have molecular masses which are generally between 600 and 6000 g/mol.
The coating compositions according to the invention may contain one or more of the resins listed above.
The coating compositions according to the invention may contain various additives and/or fillers, such as pigments or colorants, and antipitting, reducing and antioxidant agents and the like and reinforcing fillers: derivatives and hindered amines, magnesium carbonate, quartz, boron nitride, the kaolin sold under the trade name "Frantex.RTM.", wollastonite, titanium dioxide, ballotini, talc, mica, which are sold under the names "Dolomie.RTM." (calcium magnesium double carbonate), "Plastorite" (mixture of quartz, mica and chlorite), "Minex.RTM." (calcium carbonate), and carbon black, salicylates, nickel titanate, molybdenum disulphide, aluminium flakes, iron oxide, zinc oxide and organic pigments like phthalocyanine and anthraquinone derivatives.
It is possible to incorporate into the compositions of the invention additives chosen especially from those described above and whose respective proportions remain within the limits usually encountered i
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Juhue Didier
Rennie Stephen
Tedoldi Arnaud
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